linux-kernel - Re: [PATCH] perf: Fix multi-segment problem of perf_event_intel

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Date:	Thu, 2 Jul 2015 13:17:18 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Taku Izumi <izumi.taku@...fujitsu.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...hat.com, acme@...nel.org,
	kan.liang@...el.com, ak@...ux.intel.com, eranian@...gle.com
Subject: Re: [PATCH] perf: Fix multi-segment problem of
 perf_event_intel_uncore

On Thu, Jul 02, 2015 at 05:01:40AM +0900, Taku Izumi wrote:
> +	raw_spin_lock(&pci2phy_map_lock);
> +	list_for_each_entry(map, &pci2phy_map_head, list) {
> +		if (map->segment == pci_domain_nr(pdev->bus)) {
> +			phys_id = map->pbus_to_physid[pdev->bus->number];
> +			break;
> +		}
> +	}
> +	raw_spin_unlock(&pci2phy_map_lock);

> +	raw_spin_lock(&pci2phy_map_lock);
> +	list_for_each_entry(map, &pci2phy_map_head, list) {
> +		if (map->segment == pci_domain_nr(pdev->bus)) {
> +			phys_id = map->pbus_to_physid[pdev->bus->number];
> +			break;
> +		}
> +	}
> +	raw_spin_unlock(&pci2phy_map_lock);

> +	raw_spin_lock(&pci2phy_map_lock);
> +	list_for_each_entry(map, &pci2phy_map_head, list) {
> +		if (map->segment == segment) {
> +			found = true;
> +			break;
> +		}
> +	}
> +	if (!found) {
> +		map = kmalloc(sizeof(struct pci2phy_map), GFP_KERNEL);
> +		if (map) {
> +			map->segment = segment;
> +			map->pbus_to_physid[bus] = 0;
> +			list_add_tail(&map->list, &pci2phy_map_head);
> +		}
> +	} else {
> +		map->pbus_to_physid[bus] = 0;
> +	}
> +	raw_spin_unlock(&pci2phy_map_lock);

> +		raw_spin_lock(&pci2phy_map_lock);
> +		list_for_each_entry(map, &pci2phy_map_head, list) {
> +			if (map->segment == segment) {
> +				found = true;
> +				break;
> +			}
> +		}
> +		if (!found) {
> +			map = kmalloc(sizeof(struct pci2phy_map), GFP_KERNEL);
> +			if (!map) {
> +				err = -ENOMEM;
> +				break;
> +			}
> +			map->segment = segment;
> +			list_add_tail(&map->list, &pci2phy_map_head);
> +		}
> +		raw_spin_unlock(&pci2phy_map_lock);

You'd think they invent something to avoid repetitions like that.. Oh
wait..
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